JP2731608B2 - Air conditioner - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner, and more particularly to a separate air-cooling type suitable for flowing a large amount of high-temperature gas through a reheat heat exchanger during dehumidification. The present invention relates to an air conditioner.

[Prior Art] A conventional air conditioner provided with a reheat heat exchanger will be described with reference to FIG.

FIG. 3 is a refrigeration cycle system diagram of a conventional air conditioner.

In FIG. 3, 1 is a compressor, 2 is a four-way valve, 3 is an outdoor heat exchanger, 4 is a capillary tube relating to a decompressor,
5 is an indoor first heat exchanger, 6A is a reheat heat exchanger (hereinafter referred to as a reheater) related to the indoor second heat exchanger, 9 is an accumulator, 16 is a three-way valve, 17, 18, 19 is a capillary tube relating to the pressure reducer.

The compressor 1, the four-way valve 2, the outdoor heat exchanger 3, the capillary tube 4, and the accumulator 9 are in the outdoor unit, and the indoor first heat exchanger 5, the reheater 6A, the three-way valve 16, the capillary tube 17, 18, 19 are arranged in the indoor unit.

During the cooling operation, the outdoor heat exchanger 3 functions as a condenser, and the indoor first heat exchanger 5 and the reheater 6A function as an evaporator. During the heating operation, the indoor first heat exchanger 5 and the The heater 6A functions as a condenser, and the outdoor heat exchanger 3 functions as an evaporator.

During the dehumidifying operation, the refrigerant is supplied to the compressor 1-four-way valve 2-outdoor heat exchanger (condenser) 3-capillary tube 4-three-way valve 16
-Reheater 6A-Capillary tube 19-Indoor first heat exchanger (evaporator) 5-Four-way valve 2-Accumulator 9-Compressor 1 flows. That is, the refrigerant is configured to flow in series in the order of the reheater 6A and the indoor first heat exchanger 5.

Further, as another conventional example, two types of evaporators, a reheat heat exchanger and a cooling heat exchanger, are provided, and the gas refrigerant separated into gas and liquid by the receiver is supplied to the reheat heat exchanger. To the heat exchanger for cooling to perform the dehumidification operation, a four-way valve is interposed in the system path of the gas refrigerant, and during the dehumidification operation, the gas refrigerant flows into the heat exchanger for reheating and condenses The gas refrigerant stops flowing to the reheat heat exchanger by switching the four-way valve during cooling operation, and the liquid refrigerant flows to the reheat heat exchanger in the same way as the cooling heat exchanger during cooling operation. A technique for acting as described in JP-A-53-117056.

[Problem to be Solved by the Invention] In the conventional air conditioner shown in FIG.
All of the refrigerant flowing through 6A passes through the three-way valve 16, causing a large pressure loss and causing a problem of lowering the performance of the refrigeration cycle.

As shown in FIG. 3, a three-way valve is provided on the indoor unit side.
16, and 3 decompressors (capillary tubes 17, 18, 1
Since the refrigerant in the gas-liquid mixed state flows only through the capillary tube 19 among the three capillary tubes in the chamber during dehumidification, there is a problem in that the refrigerant noise increases. Generally, the valve is designed on the premise of the flow of liquid, and generates noise when flowing in a mixed state of gas and liquid.

Furthermore, in the technology described in Japanese Utility Model Application Laid-Open No. 53-117056, the problem of pressure loss due to the four-way valve, and noise due to the four-way valve and four capillary tubes have not been taken into consideration.

The present invention has been made in order to solve the above-described problems of the prior art, a comfortable dehumidification of less room temperature and less fluctuation,
In particular, it is an object of the present invention to provide an air conditioner that enables cooling dehumidification and heating dehumidification, improves the refrigeration cycle performance with less pressure loss, and can reduce the refrigerant noise on the indoor side. .

Another object of the present invention is to make the reheater function as a refrigerant reservoir during a heating operation, thereby automatically adjusting the amount of the refrigerant, thereby enabling an optimal cycle to be formed.

[Means for Solving the Problems] In order to achieve the above object, a configuration of an air conditioner according to the present invention includes a compressor, a four-way valve, an outdoor heat exchanger, an indoor heat exchanger, a decompression unit, and In an air conditioner comprising pipes connected to form a refrigeration cycle, during a dehumidifying operation, a distributor that distributes refrigerant from the outdoor heat exchanger and flows it in parallel to the indoor heat exchanger, One of the flows in the pressure reducing means interposed between the pipe distributor and the refrigerant inflow side of the indoor heat exchanger, and between the four-way valve of the other flow pipe and the indoor heat exchanger And a pressure reducing means interposed at a position, wherein one flow of the indoor heat exchanger functions for cooling and the other flow functions for reheating.

In addition, the distributor is configured such that its distributor is positioned up and down in the direction of gravity, the upper side is connected to a pipe for reheating, and the lower side is connected to a pipe for cooling.

[Operation] The operation of the above technical means is as follows.

(1) By flowing the refrigerant in parallel to the reheater of the indoor heat exchanger and the cooler (evaporator) connected in parallel, it is possible to perform the dehumidification with a lowering of the room temperature and less fluctuation.

(2) By sending a warm refrigerant gas to the reheater and flowing the refrigerant in parallel to the evaporator and the reheater as in (1) above, it is possible to dehumidify the heating.

In addition, by flowing the refrigerant only to the evaporator functioning as a dehumidifying heat exchanger, it is possible to perform dehumidification with cooling.

(3) The pipe branch of the reheater and the evaporator is a distributor, and the distributor is positioned up and down in the direction of gravity, so that high-temperature gas is supplied to the reheater, which is a reheat heat exchanger. In addition to improving the effect of feeding reheating, the liquid refrigerant can be sent to the indoor-side first heat exchanger (evaporator) serving as the dehumidifying heat exchanger to increase the dehumidifying amount.

[Embodiment] An embodiment of the present invention will be described below with reference to FIG. 1 and FIG.

FIG. 1 is a refrigeration cycle system diagram of an air conditioner according to one embodiment of the present invention, and FIG. 2 shows the operation of valves and heat exchangers during cooling, heating, and dehumidifying operations by the device of FIG. FIG.

In FIG. 1, 1 is a compressor whose rotation speed is variable by inverter control or the like, 2 is a four-way valve for switching the refrigerant flow direction, 3 is an outdoor heat exchanger, 4 is a capillary tube relating to a decompressor, Reference numeral 9 denotes an accumulator, which is provided in an outdoor unit.

5 is an indoor first heat exchanger to be a heat exchanger for dehumidification, 6 is an indoor second heat exchanger (hereinafter referred to as a reheater) to be a heat exchanger for reheating, and 7 is a room. A capillary tube related to the decompressor on the inner first heat exchanger side, 8 is a capillary tube related to the decompressor on the reheater side, and 10 is a parallel connection of the indoor first heat exchanger 5 and the reheater 6. This is a distributor provided at a branch connected to a pipe. Reference numeral 11 denotes a pipe on the indoor first heat exchanger 5 side, and reference numeral 12 denotes a pipe on the reheater 6 side.
Are branched at the distributor 10 and merged at the merging section 15.

Here, the distributor 10 has its distribution part positioned vertically above and below in the direction of gravity. The upper side is connected to the pipe 12 on the side of the reheater 6, and the lower side is connected to the pipe 11 on the side of the first indoor heat exchanger 5. Connected to

Reference numeral 13 denotes a two-way valve (open / close valve) provided in the pipe 12 between the distributor 10 and the reheater 6, and reference numeral 14 denotes a check valve.

That is, as shown in FIG.
10 to the junction 15 via the capillary tube 7 and the indoor first heat exchanger, and the pipe 12 side is connected to the two-way valve 13,
Junction 1 via check valve 14, reheater 6, and capillary tube 8
There are equipment arrangements up to 5, which are arranged in indoor units.

Although FIG. 1 shows an example in which the pressure reducer is a capillary tube, it goes without saying that an electric expansion valve may be employed.

Although not shown, an outdoor blower whose rotation speed is variable near the outdoor heat exchanger 3 and an indoor blower near the indoor first and second heat exchangers are arranged. Needless to say.

Next, the operation of the separate type air-cooled heat pump type air conditioner of this embodiment will be described.

During the cooling operation, the two-way valve 13 is closed as shown in FIG. 2, and the first indoor heat exchanger 5 acts as an evaporator (（).
), The reheater 6 does not work (x), and the outdoor heat exchanger 3
Acts as a condenser.

The refrigerant flows like compressor 1-four-way valve 2-outdoor heat exchanger 3-capillary tube 4, 7-indoor first heat exchanger 5-four-way valve 2-accumulator 9-compressor 1.

On the other hand, during the heating operation, as shown in FIG.
And the first indoor heat exchanger 5 acts as a condenser (凝縮).
), The reheater 6 acts as a refrigerant reservoir (△), and the outdoor heat exchanger 3 acts as an evaporator.

The refrigerant is supplied to the compressor 1-the four-way valve 2-the indoor first heat exchanger 5
It circulates like a capillary tube 7,4, an outdoor heat exchanger 3, a four-way valve 2, an accumulator 9, and a compressor 1.

During this heating operation, the refrigerant gas flowing through the capillary tube 8 flows into the reheater 6 and exchanges heat with the outside air. However, since the check valve 14 and the two-way valve 13 are closed, the refrigerant is supplied to the reheater 6 part. The liquid will accumulate. At the start of the heating operation, the refrigerant liquid accumulates in the reheater 6 and the circulation system has little circulating refrigerant. When the room becomes warm, the refrigerant liquid in the reheater 6 decreases, and the refrigerant liquid increases in the cycle system, thereby forming a heating cycle.

As described above, the reheater 6 functions as a refrigerant reservoir, and the amount of the circulating refrigerant is automatically adjusted, so that an optimal heating cycle can be formed. This has an effect unique to the present embodiment during the heating operation.

Next, during the dehumidifying operation, as shown in FIG.
And the indoor-side first heat exchanger 5 and the reheater 6 perform a dehumidifying and reheating action in parallel (indicated by a circle).

The high-temperature, high-pressure refrigerant gas discharged from the compressor 1 passes through the four-way valve 2 and exchanges heat with the outside air in the outdoor heat exchanger 3 to condense.
The pressure is reduced by the capillary tube 4 and the distributor is in a gas-liquid mixed state.
Reaches 10

In the distributor 10, a warm gas component flows into the piping 12 above the distribution unit positioned vertically in the direction of gravity.

At the same time, a liquid component flows into the pipe 11 below the distribution section positioned vertically in the direction of gravity.

The liquid refrigerant flowing into the pipe 11 is further decompressed by the capillary tube 7 and flows through the indoor first heat exchanger (evaporator) 5 serving as a dehumidifying heat exchanger to exchange heat with indoor air to obtain a large amount of dehumidification. Can be.

On the other hand, the gas refrigerant flowing into the pipe 12 flows through the reheater 6, which is a reheat heat exchanger, via the two-way valve 13 and the check valve 14,
The indoor air dehumidified and cooled in the indoor first heat exchanger 5 is reheated to supply comfortable dehumidified air to the room. Reheater 6
The gas refrigerant that has passed through is further decompressed by the capillary tube 8 to become a low-temperature low-pressure refrigerant gas, merges with the refrigerant gas on the pipe 11 at the junction 15, and returns to the compressor 1 via the four-way valve 2 and the accumulator 9.

In this way, by opening the two-way valve 13 and sending warm refrigerant gas to the reheater 6 to increase the reheating efficiency, comfortable warm dehumidified air is supplied into the room, and heating dehumidification is performed.

In the dehumidifying operation, the two-way valve 13 is closed and the reheater 6 is closed.
When the dehumidification is performed in the indoor first heat exchanger 5 without sending the refrigerant to the room, cool dehumidified air is supplied into the room, and cooling-type dehumidification is performed.

 According to this embodiment, the following effects can be obtained.

(1) By providing the reheater 6 and the two-way valve 13 for deciding whether or not to function the refrigerant, the refrigerant is connected in parallel to the indoor first heat exchanger (evaporator) 5 and the reheater 6. By flowing
Heating dehumidification is possible, and the two-way valve 13 is closed,
Cooling and dehumidification is possible by flowing the refrigerant only through the heat exchanger (evaporator) 5. In short, it is possible to perform the dehumidification with a reduced room temperature and little fluctuation.

(2) The branch part of the piping system of the indoor first heat exchanger 5 and the reheater 6 is used as a distributor 10, and the distribution part is positioned vertically above and below in the direction of gravity, so that high-temperature gas is supplied to the reheater 6. In addition to increasing the effect of feeding and reheating, the liquid refrigerant can be sent to the indoor first heat exchanger 5 to increase the amount of dehumidification.

(3) Since the conventional three-way valve shown in FIG. 3 does not have the three-way valve and is a two-way valve, the pressure loss is reduced and the refrigeration cycle performance can be improved.

(4) In the conventional example shown in FIG. 3, the refrigerant flows through only one of the three decompressors on the indoor side during dehumidification, whereas in the embodiment shown in FIG. Since the refrigerant flows in parallel to the two pressure reducers, the refrigerant noise can be reduced.

[Effects of the Invention] As described above in detail, according to the present invention, it is possible to perform comfortable dehumidification with a reduced room temperature and little fluctuation, in particular, dehumidification for cooling and dehumidification for heating, and a refrigeration cycle with low pressure loss. It is possible to provide an air conditioner having improved performance and capable of reducing refrigerant noise on the indoor side.

[Brief description of the drawings]

FIG. 1 is a system diagram of a refrigeration cycle of an air conditioner according to one embodiment of the present invention, and FIG. 2 is a diagram showing the operation of valves and heat exchangers during cooling, heating, and dehumidifying operations by the device of FIG. FIG. 3 is a diagram showing a refrigeration cycle system of a conventional air conditioner. 1 ... Compressor, 2 ... Four-way valve, 3 ... Outdoor heat exchanger,
4, 7, 8… Capillary tube, 5… Indoor first heat exchanger, 6… Reheater, 10… Distributor, 11, 12… Piping, 1
3 Two-way valve.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hiroshi Kogure 800, Tomita, Ohira-machi, Ohira-machi, Shimotsuga-gun, Tochigi Inside the Tochigi Plant of Hitachi, Ltd. Hitachi, Tochigi factory

Claims (2)

(57) [Claims] 1. An air conditioner comprising a compressor, a four-way valve, an outdoor heat exchanger, an indoor heat exchanger, a pressure reducing means, and a pipe connecting these to form a refrigeration cycle. A distributor that distributes the refrigerant from the heat exchanger and flows it in parallel to the indoor heat exchanger, and between the distributor of the pipe for one of the parallel flows and the refrigerant inflow side of the indoor heat exchanger A pressure reducing means interposed at the position, and a pressure reducing means interposed between the four-way valve of the other flow pipe and the indoor heat exchanger, and one flow of the indoor heat exchanger is cooled. An air conditioner, wherein the other stream functions as a reheat. 2. The distributor according to claim 1, wherein the distributor is disposed vertically in the direction of gravity, the upper side is connected to a reheating pipe, and the lower side is connected to a cooling pipe. Air conditioner.